<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>

    <script>

        // 1 * 2 * 3 * 4 * 5 

        // 1-4  res * 5
        // 1-3  res * 4
        // 1-2  res * 3
        // 1    res * 2


        function jc(n) {
            if(n === 1) {
                return 1 
            }
            return jc(n - 1) * n
        }

        console.log(jc(5))

    </script>
    
</body>
</html>